After about 18 months of research and waiting to see if the interest would fade, I've decided to take the plunge!
I've decided on an ES 127mm APO with the new FCD100 glass. I've chosen primarily for it's potential for astrophotography, but I want to build my skills and spend my money in stages, starting with getting it up and running visually. Hoping for some experienced sanity checks.
ES FCD100 127mm
focal length 952mm
f ratio 7.5
I admit I've skimped on my research of eyepieces until the week or so of putting together a purchase plan, but I think I have a pretty good idea what I'm after. I've already got a handful of cheap eyepieces I used on a borrowed dob, but I want to invest in two good eyepieces of approximate optical quality as the APO to not be bottlenecks.
I think I am initially going to avoid high magnification EPs so that I will be safely far from the highest useful magnification, will have less issues with the atmosphere, and will err on the side of brighter crisper images in a large apparent field of view.
I am buying the scope direct from ES and I think I'm going to get the EPs from them for native compatibility and similar quality to the telescope. I like the look of their EPs anyway and without having one in my hand they seem to have good build quality. So, my current plan is to get a 34mm in their 82degree series, and a 24mm in the 68degree series, and also to buy their 2x focal extender to also get 12mm and 17mm viewing options. So effectively I'd have 34mm, 24mm, 17mm and 12mm. AKA 28x, 40x, 56x, and 80x.
I may or may not also just go for a third EP, maybe their 14mm (which costs half as much as the other two), that I could get 136x out of with the barlow just to play with viewing near the seeing limit.
So my questions are:
Does this seem reasonable?
I've heard some (but not all?) focal extenders also double eye-relief. Will the ES focal extender with these eyepieces result in too much eye relief?
What is the problem with going below the lowest useful magnification of a telescope? Is it that you can't even see an image, or the image distorted, or you just don't get the telescopes full potential light gathering into your pupil?
Would I be able to use this scope and these eyepieces with any kind focal reducer? I think the answer is no, I know reducers on 2" EPs are uncommon, I think Celestron has one at .63 don't know much about it, but I read that many optical setups have trouble focusing like that.